1. Articles from H. Y. K. Cheng

    1-2 of 2
    1. Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography

      Developing dual core ytterbium doped fiber ring laser in Fourier domain mode locked operation for swept-source optical coherence tomography
      We demonstrate high efficiency and wide bandwidth gain in a Ytterbium doped fiber amplifier. The highpowered amplifier has potential applications for use with a swept-source fiber ring laser in multi-channel optical coherence tomography (OCT) system. The ring cavity design includes a 976nm pumped dual core Yb doped fiber as the gain medium, where a rotating polygon mirror is used as a wavelength-sweeping filter for this source. The amplified spontaneous emission (ASE) had a spectral bandwidth of 1037-1145nm at -60dBm, where a tunable lasing bandwidth of the ring cavity ranged from 1057-1115nm. The highest output power, for both the ASE and ...
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    2. Cascaded Raman fiber laser in Fourier domain mode lock operation

      Cascaded Raman fiber laser in Fourier domain mode lock operation
      In this study, a cascaded Raman fiber laser in Fourier domain mode lock operation (FDML) is presented. This laser utilizes a Ytterbium doped twin core pump laser source at 1109 nm. The pump light is directed to a cascaded Raman cavity, which consists of multiple cascaded fiber Bragg grating pairs and 3.86 km of dispersion compensation fiber, which provides Raman gain. The output wavelength of a cascaded Raman laser is determined by the Stoke’s shift (≈ 60 to 70 nm in optical fiber) and the pump laser wavelength. The power build up in the cascaded Raman cavity and shift ...
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    1-2 of 2
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  2. Topics in the News

    1. (2 articles) Sunnybrook Health Sciences Centre
    2. (2 articles) University of Toronto
    3. (2 articles) University of Hong Kong
    4. (2 articles) Ryerson University
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